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US8261168B2 - Code combining soft handoff in wireless communication system - Google Patents

Code combining soft handoff in wireless communication system Download PDF

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Publication number
US8261168B2
US8261168B2 US12/211,763 US21176308A US8261168B2 US 8261168 B2 US8261168 B2 US 8261168B2 US 21176308 A US21176308 A US 21176308A US 8261168 B2 US8261168 B2 US 8261168B2
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United States
Prior art keywords
data stream
turbo
code rate
puncture pattern
encoded
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Expired - Fee Related, expires
Application number
US12/211,763
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English (en)
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US20090077450A1 (en
Inventor
Shu Wang
Byung Kwan Yi
Sang Gook Kim
Soon Yil Kwon
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LG Electronics Inc
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LG Electronics Inc
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Publication date
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Priority to US12/211,763 priority Critical patent/US8261168B2/en
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KWON, SOON YIL, KIM, SANG GOOK, WANG, SHU, YI, BYUNG KWAN
Publication of US20090077450A1 publication Critical patent/US20090077450A1/en
Application granted granted Critical
Publication of US8261168B2 publication Critical patent/US8261168B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • H04L1/0069—Puncturing patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/007—Unequal error protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]

Definitions

  • the present invention relates to a code combining soft handoff (CCSH) method in a wireless communication system.
  • CCSH code combining soft handoff
  • a handoff is an automatic switchover of the current traffic channel that occurs when a mobile terminal moves from one cell to another cell.
  • Such a handoff is typically classified into a hard handoff and a soft handoff.
  • the hard handoff first breaks the existing communication channel before opening a new traffic channel, whereas the soft handoff first connects the new channel and then breaks the existing channel.
  • the two signals are transmitted to the respective base stations with pilot signals from respective pilot channel sections 102 a and 102 b included therein.
  • the transmitted signals are then received by the mobile terminal from each of the respective base stations.
  • the mobile terminal decodes and combines the two signals encoded with different patterns to obtain the gain.
  • CCSH is a scheme for achieving both coding gain and diversity gain, and has been adopted in a cdma2000 standard for a code division multiple access (CDMA) network. Accordingly, there is a need to apply CCSH to other types of communication technologies to achieve higher gain.
  • CDMA code division multiple access
  • the first layer is an enhancement layer and the second layer is a base layer.
  • the first LOI and the second LOI broadcast the same data stream at the same time and the same logical channel.
  • the data stream includes a flow description message comprising a transmit mode extension field.
  • the data stream is transmitted along with a flow description message comprising a transmit mode extension field.
  • the data stream includes a system parameters message comprising a control channel transmit mode extension field.
  • the data stream is transmitted along with a system parameters message comprising a control channel transmit mode extension field.
  • transmit modes for transmitting the data stream comprise 16-QAM modulation and a turbo code rate of 1/3, QPSK modulation and a turbo code rate of 1/5, layered modulation with energy ratio 4 and a turbo code rate of 1/3, and layered modulation with energy ratio 6.25 and a turbo code rate of 1/3.
  • transmit modes related to a second turbo encoded puncture pattern for transmitting the data stream comprise, QPSK modulation and a turbo code rate of 1/3, QPSK modulation and a turbo code rate of 1/2, 16-QAM modulation and a turbo code rate of 1/3, 16-QAM modulation and a turbo code rate of 1/2, 16-QAM modulation and a turbo code rate of 2/3, QPSK modulation and a turbo code rate of 1/5, layered modulation with energy ratio 4 and a turbo code rate of 1/3, layered modulation with energy ratio 4 and a turbo code rate of 1/2, layered modulation with energy ratio 4 and a turbo code rate of 2/3, layered modulation with energy ratio 6.25 and a turbo code rate of 1/3, layered modulation with energy ratio 6.25 and a turbo code rate of 1/2, and layered modulation with energy ratio 6.25 and a turbo code rate of 2/3.
  • FIG. 1 is a block diagram of a transmission part facilitating a code combining soft handoff method.
  • FIG. 2 illustrates a graph for determining a multi-access channel capacity in accordance with one embodiment of the present invention.
  • FIG. 3 illustrates a combined coding soft handoff (CCSH) architecture in accordance with one embodiment of the present invention.
  • FIG. 4 illustrates a first approach for applying CCSH on an OFDM system in accordance with one embodiment of the present invention.
  • FIG. 5 illustrates a second approach for applying CCSH on an OFDM system in accordance with one embodiment of the present invention.
  • FIG. 6 illustrates a third approach for applying CCSH on an OFDM system in accordance with one embodiment of the present invention.
  • FIG. 7 illustrates a fourth approach for applying CCSH on an OFDM system in accordance with one embodiment of the present invention.
  • FIG. 8 illustrates a superimposed pilot design in accordance with one embodiment of the present invention.
  • FIGS. 9 and 10 illustrate a method for complementarily multiplexing pilots in accordance with one embodiment of the present invention.
  • FIG. 11 illustrates a multi-frequency network (MFN) in accordance with one embodiment of the present invention.
  • FIG. 12 illustrates a turbo encoder structure in accordance with one embodiment of the present invention.
  • FIGS. 13 and 14 illustrate puncture patterns employed by the turbo encoder of FIG. 12 for generating turbo-encoded bit sequences in accordance with one embodiment of the present invention.
  • FIG. 16 illustrates an example of a second of two puncture patterns used in accordance with one embodiment of the present invention.
  • the present invention relates to transmitting a signal in a wireless communication system utilizing code combining soft handoff technology.
  • FIG. 2 illustrates a graph for determining a multi-access channel capacity in accordance with one embodiment of the present invention.
  • MAC medium access control
  • an optimal access strategy for a transmitting side is to spread a signal across an entire bandwidth.
  • the optimal access strategy is to maximize interference cancellation. Accordingly, this strategy may be applied to a soft handoff scenario as well.
  • FIG. 3 illustrates a combined coding soft handoff (CCSH) architecture in accordance with one embodiment of the present invention.
  • CCSH combined coding soft handoff
  • CCSH has been applied to a CDMA network. Therefore, when applying CCSH to an OFDM system, the present invention considers differences between CDMA and OFDM. For example, CDMA requires relatively simple channel estimation. Thus, one pilot sequence for each link may be enough. However, QFDM expects more accurate channel tracking. Accordingly, in OFDM, multiple pilot subcarriers are preferred.
  • a method for applying CCSH on and OFDM transmission provides how to place pilot channels and traffic channels from within a cell, and how to schedule pilot/traffic channels between cells. Referring to Table (1) and FIGS. 4-7 , four approaches are described.
  • pilot channels and traffic channels are orthogonal, Between BSs, pilot channels and traffic channels are orthogonal.
  • a session initiation protocol (SIP) is applied to pilot channels and traffic channels. Between BSs, channels for which an SIP has been applied are orthogonal to each other.
  • SIP session initiation protocol
  • pilot channels and traffic channels are orthogonal. Between BSs, pilot channels are orthogonal but traffic channels are overlapped.
  • Table (2) summarizes characteristics of the four approaches. As shown in Table (2), orthogonal multiplexing approaches, such as TDM/FDM/OFDM, provide low receiver complexity and low spectral efficiency. Nonorthogonal multiplexing approaches, such SIP and CMP, provide high receiver complexity and high spectral efficiency.
  • FIG. 8 illustrates a superimposed pilot design in accordance with one embodiment of the present invention.
  • FIGS. 9 and 10 illustrate a method for complementarily multiplexing pilots in accordance with one embodiment of the present invention.
  • a pilot for a transmitter is placed to complementarily overlap pilots of other transmitters in both a time and frequency domain.
  • the pilot patterns are not orthogonal to each other in general.
  • pilot signals when a mobile terminal receives pilot signals from multiple cells, the pilot signals are overlapped with each other in both the time and frequency domain. If each link channel response is not long, the pilot signals can be separated and estimated in the time domain using a Fast Fourier Transform (FFT) or Inverse Fast Fourier Transform (IFFT).
  • FFT Fast Fourier Transform
  • IFFT Inverse Fast Fourier Transform
  • the network can estimate the delay or the delay difference between each mobile terminal and each of nearby cells.
  • the involved mobile terminal can estimate the propagation delay and feed back the timing difference to the network.
  • the mobile terminal when a mobile terminal communicates with multiple base stations (BSs), the mobile terminal is considered to be in a soft handoff region. If two or more BSs are working in the same frequency with the same content, the BSs comprise a single frequency network (SFN). If the BSs are in different frequencies, the network is considered to be a multi-frequency network (MFN).
  • SFN single frequency network
  • MFN multi-frequency network
  • the mobile terminal may have soft handoff diversity gain because multiple BSs send multiple same signals at the same time.
  • soft handoff diversity may not exist because BSs transmit over multiple different frequencies, and the mobile terminal can only access one BS at a time.
  • FIG. 11 illustrates a multi-frequency network (MFN) in accordance with one embodiment of the present invention.
  • a mobile terminal 20 and base station TS 1 are located in a local operator infrastructure 1 (LOI 1 ).
  • a mobile terminal 40 and a base station TS 2 are located in a local operator infrastructure 2 (LOI 2 ).
  • a mobile terminal 30 is located in both the LOI 1 and LOI 2 .
  • a code combining soft handoff (CCSH) method is implemented for achieving more diversity gain and coding gain for mobile terminals in the MFN soft handoff region.
  • CCSH code combining soft handoff
  • FIG. 12 illustrates a turbo encoder structure in accordance with one embodiment of the present invention.
  • FIGS. 13 and 14 illustrate puncture patterns employed by the turbo encoder of FIG. 12 for generating turbo-encoded bit sequences in accordance with one embodiment of the present invention.
  • puncture patterns for data bit periods are organized in a table.
  • the puncture table is read from top to bottom.
  • puncture patterns for tail bit periods are organized in a table.
  • the puncturing table is read from top to bottom, and then from left to right.
  • the puncturing table is read from top to bottom repeating X and X′, and then from left to right.
  • rate-2/3 turbo codes the puncturing table is read from top to bottom, and then from left to right.
  • LOI 1 and LOI 2 in FIG. 11 are operated with different carrier frequencies. Accordingly, the local area content of each LOI may be different in either the time domain or frequency domain. However, the two LOIs may share the same wide-area content in both the time and frequency domains, such as when the mobile terminal 30 of FIG. 11 is located in both LOI 1 and LOI 2 .
  • two different turbo encoding puncture patterns may be used individually by a respective LOI to code a transmitted signal. This is preferred in order to provide forward link only (FLO) devices in handoff regions the chance to apply code combining soft handoff (CCSH). Furthermore, the present invention may aid FLO devices in handoff regions to obtain more coding gain in addition to frequency diversity gain.
  • FLO forward link only
  • CCSH code combining soft handoff
  • a data stream is channel coded using a first turbo encoded puncture pattern of a first local operator infrastructure (LOI), and channel coded using a second turbo encoded puncture pattern of a second LOI that neighbors the first LOI.
  • the data stream is differentiated into at least a first layer data stream and a second layer data stream.
  • the first layer may be an enhancement layer
  • the second layer may be a base layer.
  • the first layer data stream may be channel coded using the first turbo encoded puncture pattern and the second turbo encoded puncture pattern.
  • the second layer data stream may be channel coded using the first turbo encoded puncture pattern and the second turbo encoded puncture pattern.
  • the first layer data stream and the second layer data stream channel coded using the first turbo encoded puncture pattern may be transmitted via the first LOI.
  • the first layer data stream and the second layer data stream channel coded using the second turbo encoded puncture pattern may be transmitted via the second LOI.
  • FIG. 15 illustrates an example of a first of two puncture patterns used in accordance with one embodiment of the present invention.
  • the puncturing tables of puncture pattern A are essentially the same as the puncturing tables of FIGS. 13 and 14 .
  • FIG. 16 illustrates an example of a second of two puncture patterns used in accordance with one embodiment of the present invention.
  • a puncture pattern B of FIG. 16 may be the same as the puncture pattern A of FIG. 15 .
  • the puncture pattern B be different from, or complementary to, the puncture pattern A.
  • Table (3) below illustrates a transmit mode table used in conjunction with a FLO broadcasting system in accordance with one embodiment of the present invention.
  • Table (4) below illustrates a transmit mode table used in conjunction with a FLO broadcasting system in accordance with another embodiment of the present invention. As shown, transmit modes for puncture patterns A and B are described.
  • Table (5) illustrates a flow description message used in conjunction with a FLO broadcasting system in accordance with one embodiment of the present invention.
  • a TransmitMode parameter in the flow description message is set to not be greater than 4 bits.
  • Table (6) illustrates a system parameters message used in conjunction with a FLO broadcasting system in accordance with one embodiment of the present invention.
  • a ControlChannelTXMode parameter in the system parameters message is set to not be greater than 4 bits.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US12/211,763 2007-09-17 2008-09-16 Code combining soft handoff in wireless communication system Expired - Fee Related US8261168B2 (en)

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US1464307P 2007-12-18 2007-12-18
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120137190A1 (en) * 2010-11-25 2012-05-31 Panteleev Pavel A Reconfigurable encoding per multiple communications standards
US20160028561A1 (en) * 2009-11-18 2016-01-28 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving data in a communication system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101436865B (zh) * 2008-07-31 2012-01-04 华为技术有限公司 对经过Turbo编码后的比特流进行打孔的方法及装置
JP2011211554A (ja) * 2010-03-30 2011-10-20 Hitachi Plant Technologies Ltd 無線センサーネットワークシステム
RU2688751C2 (ru) * 2013-12-30 2019-05-22 Хуавей Текнолоджиз Ко., Лтд. Способ и устройство согласования кодовой скорости полярного кода
WO2022056862A1 (fr) * 2020-09-18 2022-03-24 Qualcomm Incorporated Codage sans débit avec modulation en couches

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640414A (en) * 1992-03-05 1997-06-17 Qualcomm Incorporated Mobile station assisted soft handoff in a CDMA cellular communications system
US6094427A (en) * 1998-07-07 2000-07-25 Lg Information And Communications, Ltd. Communications system handoff operation combining turbo coding and soft handoff techniques
US20020004397A1 (en) * 2000-07-08 2002-01-10 Lg Electronics Inc. Code combining soft handoff method
US6430722B1 (en) * 1998-01-23 2002-08-06 Hughes Electronics Corporation Forward error correction scheme for data channels using universal turbo codes
US6704299B1 (en) 1999-11-30 2004-03-09 Nortel Networks Limited Efficient frame quality indicator for a wireless signal decoder
US20050204269A1 (en) * 2004-01-20 2005-09-15 Shoemake Matthew B. Coding apparatus, and associated method, for forming a punctured binary convolutional code for use in a radio communication system
US20060114910A1 (en) * 2001-05-22 2006-06-01 Nagabhushana Sindhushayana Enhanced channel interleaving for optimized data throughput
US20060256708A1 (en) * 2004-07-29 2006-11-16 Wang Michael M System and method for time diversity
US20070014251A1 (en) * 2005-04-21 2007-01-18 Dilithium Networks Pty Ltd. Fast session setup extensions to H.324
US20070183432A1 (en) * 2006-02-03 2007-08-09 Lg Electronics Inc. Method for performance enhancement in a cell edge region
US20080016425A1 (en) * 2006-04-04 2008-01-17 Qualcomm Incorporated Turbo decoder with symmetric and non-symmetric decoding rates
US20080101492A1 (en) * 2006-10-31 2008-05-01 Jean-Philippe Gregoire Method for Tracking Phase Noise in an OFDM System
US7536624B2 (en) * 2002-01-03 2009-05-19 The Directv Group, Inc. Sets of rate-compatible universal turbo codes nearly optimized over various rates and interleaver sizes
US20090319845A1 (en) * 2006-04-29 2009-12-24 Hang Liu Seamless Handover of Multicast Sessions in Internet Protocol Based Wireless Networks Using Staggercasting
US7814399B2 (en) * 1999-05-05 2010-10-12 Qualcomm Incorporated Apparatus and method of early decoding in communication systems

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640414A (en) * 1992-03-05 1997-06-17 Qualcomm Incorporated Mobile station assisted soft handoff in a CDMA cellular communications system
US6430722B1 (en) * 1998-01-23 2002-08-06 Hughes Electronics Corporation Forward error correction scheme for data channels using universal turbo codes
US6094427A (en) * 1998-07-07 2000-07-25 Lg Information And Communications, Ltd. Communications system handoff operation combining turbo coding and soft handoff techniques
US7814399B2 (en) * 1999-05-05 2010-10-12 Qualcomm Incorporated Apparatus and method of early decoding in communication systems
US6704299B1 (en) 1999-11-30 2004-03-09 Nortel Networks Limited Efficient frame quality indicator for a wireless signal decoder
US20020004397A1 (en) * 2000-07-08 2002-01-10 Lg Electronics Inc. Code combining soft handoff method
US20060114910A1 (en) * 2001-05-22 2006-06-01 Nagabhushana Sindhushayana Enhanced channel interleaving for optimized data throughput
US7536624B2 (en) * 2002-01-03 2009-05-19 The Directv Group, Inc. Sets of rate-compatible universal turbo codes nearly optimized over various rates and interleaver sizes
US20050204269A1 (en) * 2004-01-20 2005-09-15 Shoemake Matthew B. Coding apparatus, and associated method, for forming a punctured binary convolutional code for use in a radio communication system
US20060256708A1 (en) * 2004-07-29 2006-11-16 Wang Michael M System and method for time diversity
US20070014251A1 (en) * 2005-04-21 2007-01-18 Dilithium Networks Pty Ltd. Fast session setup extensions to H.324
US20070183432A1 (en) * 2006-02-03 2007-08-09 Lg Electronics Inc. Method for performance enhancement in a cell edge region
US20080016425A1 (en) * 2006-04-04 2008-01-17 Qualcomm Incorporated Turbo decoder with symmetric and non-symmetric decoding rates
US20090319845A1 (en) * 2006-04-29 2009-12-24 Hang Liu Seamless Handover of Multicast Sessions in Internet Protocol Based Wireless Networks Using Staggercasting
US20080101492A1 (en) * 2006-10-31 2008-05-01 Jean-Philippe Gregoire Method for Tracking Phase Noise in an OFDM System

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160028561A1 (en) * 2009-11-18 2016-01-28 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving data in a communication system
US10038576B2 (en) * 2009-11-18 2018-07-31 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving data in a communication system
US10425258B2 (en) 2009-11-18 2019-09-24 Samsung Electronics Co., Ltd Method and apparatus for transmitting and receiving data in a communication system
US20120137190A1 (en) * 2010-11-25 2012-05-31 Panteleev Pavel A Reconfigurable encoding per multiple communications standards
US8700969B2 (en) * 2010-11-25 2014-04-15 Lsi Corporation Reconfigurable encoding per multiple communications standards

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CN101803238A (zh) 2010-08-11
US20090077450A1 (en) 2009-03-19
WO2009038339A3 (fr) 2009-05-14
WO2009038339A2 (fr) 2009-03-26
CN101803238B (zh) 2013-09-11

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